web: isolate clipboard handling (#7229)

We would like to use the clipboard for more than just the token copy button.  This commit
enables that by separating the "Write to Clipboard" and "Write to Notifications" routines
into separate functions, putting "writeToClipboard" into the utilities collection, and
clarifying what happens when a custom presses the TokenCopy button.

web/src/elements/buttons/TokenCopyButton/ak-token-copy-button.ts

@@ -1,12 +1,14 @@
 import { DEFAULT_CONFIG } from "@goauthentik/common/api/config";
 import { MessageLevel } from "@goauthentik/common/messages";
 import { showMessage } from "@goauthentik/elements/messages/MessageContainer";
-import { isSafari } from "@goauthentik/elements/utils/isSafari";
+import { writeToClipboard } from "@goauthentik/elements/utils/writeToClipboard";
 
+import { msg } from "@lit/localize";
 import { customElement, property } from "lit/decorators.js";
 
 import { CoreApi, ResponseError, TokenView } from "@goauthentik/api";
 
+import { APIMessage } from "../../messages/Message";
 import BaseTaskButton from "../SpinnerButton/BaseTaskButton";
 
 /**
@@ -51,35 +53,26 @@ export class TokenCopyButton extends BaseTaskButton {
         });
     };
 
-    onSuccess(token: unknown) {
+    async onSuccess(token: unknown) {
         super.onSuccess(token);
         if (!isTokenView(token)) {
             throw new Error(`Unrecognized return from server: ${token}`);
         }
-
-        // Insecure origins may not have access to the clipboard. Show a message instead.
-        if (!navigator.clipboard) {
-            showMessage({
-                level: MessageLevel.info,
-                message: token.key as string,
-            });
-            return;
-        }
-
-        // Safari only allows navigator.clipboard.write with native clipboard items.
-        if (isSafari()) {
-            navigator.clipboard.write([
-                new ClipboardItem({
-                    "text/plain": new Blob([token.key as string], {
-                        type: "text/plain",
-                    }),
-                }),
-            ]);
-            return;
-        }
-
-        // Default behavior: write the token to the clipboard.
-        navigator.clipboard.writeText(token.key as string);
+        const wroteToClipboard = await writeToClipboard(token.key as string);
+        const info: Pick<APIMessage, "message" | "description"> = wroteToClipboard
+            ? {
+                  message: msg("The token has been copied to your clipboard"),
+              }
+            : {
+                  message: token.key,
+                  description: msg(
+                      "The token was displayed because authentik does not have permission to write to the clipboard",
+                  ),
+              };
+        showMessage({
+            level: MessageLevel.info,
+            ...info,
+        });
     }
 
     async onError(error: unknown) {

web/src/elements/utils/writeToClipboard.ts

@@ -0,0 +1,26 @@
+import { isSafari } from "./isSafari";
+
+export async function writeToClipboard(message: string) {
+    if (!navigator.clipboard) {
+        return false;
+    }
+
+    // Safari only allows navigator.clipboard.write with native clipboard items.
+    try {
+        if (isSafari()) {
+            await navigator.clipboard.write([
+                new ClipboardItem({
+                    "text/plain": new Blob([message], {
+                        type: "text/plain",
+                    }),
+                }),
+            ]);
+        } else {
+            await navigator.clipboard.writeText(message);
+        }
+        return true;
+    } catch (_) {
+        /* no op */
+    }
+    return false;
+}